The intelligent RS 232/PPI multimaster cable can be used for the connection between modems and the S7-200. It is then possible to connect modems such as the GSM modem MD720-3 with RS232 interface to the PPI interface of the S7-200 without using a gender changer. As a result of the short cable lengths and the industrial Velcro fasteners, the PPI modem cable is suitable for use in control cabinets.